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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.54
Absolute: -2.61
Spectral ClassB3Vnp(shell) blue main sequence star
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star.

A blue main sequence star with an unusual spectrum, Achernar has a magnitude of +0.54, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The river's end: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

Imagery provided by Aladin sky atlas

HR Diagram
6 Cassiopeiae
41 Draconis
47 Cygni
75 Cygni
a Velorum
AU Microscopii
AX Microscopii
b Velorum
Chaophraya
DH Tauri
e Aquilae
Gakyid
Gliese 440
Gliese 687
Gnomon
Guahayona
HD 37131
HR 6842
IL Aquarii
k Hydrae
KELT-20
Kepler-102
Kepler-444
KR Muscae
La Superba
Mazaalai
Mekbuda
Miram
ο1 Cygni
Petra
π Cephei
Pincoya
Polis
s Velorum A
TWA 5
w Carinae
Wouri
Xi Boötis B
ZZ Ceti
15 Orionis
52 Orionis
Acubens
Adhafera
Alchiba
Alfirk
Alkaphrah
Alnilam
Antares
Arneb
Atria
Avior
Azmidi
Berehynia
Betelgeuse
BF Orionis
Capella
Cerberus
χ Centauri
χ Cygni
d Lupi
δ Muscae
Deneb
Diya
EE Leonis
ε Indi
Erakis
η Carinae
f Velorum
FL Virginis
γ Pavonis
Gliese 205
Gliese 887
Groombridge 1618
Hatysa
HD 37130
Hind's Crimson Star
HO Librae
HR 1911
ι Leonis B
ι1 Scorpii
Kapteyn's Star
Koeia
Kruger 60 A
DO Cephei
Maru
Mebsuta
Mira
Mirfak
Mu Aquilae
Naos
Nashira
ν2 Canis Majoris
ν Cephei
ν Persei
ο Capricorni B
Orkaria
Polaris
Proxima Centauri
Ran
ρ Cassiopeiae
ρ Cygni
Rigel
α Centauri A
Ross 154
Ross 156
Ross 206
Sadr
Sargas
Shaomin
Sharjah
σ Orionis
Sirius B
Struve 2398 B
Suhail
Teegarden's Star
Tevel
Thabit
θ Circini
θ Hydrae
Tureis
U Sagittarii
Unurgunite
UV Ceti
V509 Cassiopeiae
V1099 Orionis
van Maanen's Star
Wezen
Wolf 359
Wolf 498
WX Ursae Majoris
x Carinae
ζ Arae
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

Indexes

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